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<div class="title">observer.hh</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">// -*- C++ -*-</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">// METS lib source file - observer.h</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * Software License Agreement (BSD License)</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> *  Copyright (c) 2006-2012, Mirko Maischberger &lt;mirko.maischberger@gmail.com&gt;</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> *  All rights reserved.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> *  Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> *  modification, are permitted provided that the following conditions</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> *  are met:</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"> *   * Redistributions of source code must retain the above copyright</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment"> *     notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment"> *   * Redistributions in binary form must reproduce the above</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment"> *     copyright notice, this list of conditions and the following</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment"> *     disclaimer in the documentation and/or other materials provided</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment"> *     with the distribution.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment"> *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment"> *  &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"> *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment"> *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE</span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment"> *  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"> *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment"> *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment"> *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment"> *  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment"> *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment"> *  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment"> *  POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160; </div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="preprocessor">#ifndef METS_OBSERVER_HH_</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="preprocessor">#define METS_OBSERVER_HH_</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160; </div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="preprocessor">#include &lt;set&gt;</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span> </div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160; </div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="keyword">namespace </span>mets {</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160; </div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> observed_subject&gt;</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;  <span class="keyword">class </span>observer; <span class="comment">// forward declaration</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;  </div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> observed_subject&gt;</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;  <span class="keyword">class </span>subject; <span class="comment">// forward declaration</span></div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;  </div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> observed_subject&gt;</div>
<div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="classmets_1_1update__observer.html">   56</a></span>&#160;  <span class="keyword">class </span><a class="code" href="classmets_1_1update__observer.html">update_observer</a> </div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;  {</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="classmets_1_1update__observer.html#a0f20603c0e9d109d2b8b26a4391ef588">   60</a></span>&#160;    <a class="code" href="classmets_1_1update__observer.html#a0f20603c0e9d109d2b8b26a4391ef588">update_observer</a>(observed_subject* who) : who_m(who) {}</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    <span class="keywordtype">void</span> </div>
<div class="line"><a name="l00063"></a><span class="lineno"><a class="line" href="classmets_1_1update__observer.html#ace0cfbc6604dbad39b7557bca3a2b9e1">   63</a></span>&#160;    <a class="code" href="classmets_1_1update__observer.html#ace0cfbc6604dbad39b7557bca3a2b9e1">operator()</a>(<a class="code" href="classmets_1_1observer.html">observer&lt;observed_subject&gt;</a>* o) { o-&gt;<a class="code" href="classmets_1_1observer.html#a059bb913e90c74ccc4a18d92919bb331">update</a>(who_m); }</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <a class="code" href="classmets_1_1update__observer.html">update_observer</a>();</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    observed_subject* who_m;</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;  };</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;  </div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> observed_subject&gt;</div>
<div class="line"><a name="l00083"></a><span class="lineno"><a class="line" href="classmets_1_1subject.html">   83</a></span>&#160;  <span class="keyword">class </span><a class="code" href="classmets_1_1subject.html">subject</a></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;  {</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    <span class="keyword">virtual</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    ~<a class="code" href="classmets_1_1subject.html">subject</a>() {};</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="classmets_1_1subject.html#a580c481db07f883261c0a24f0f201067">   94</a></span>&#160;    <a class="code" href="classmets_1_1subject.html#a580c481db07f883261c0a24f0f201067">attach</a>(<a class="code" href="classmets_1_1observer.html">observer&lt;observed_subject&gt;</a>&amp; o);</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="classmets_1_1subject.html#af6b5055d74cb5671e46bb57a4109cf3a">  101</a></span>&#160;    <a class="code" href="classmets_1_1subject.html#af6b5055d74cb5671e46bb57a4109cf3a">detach</a>(<a class="code" href="classmets_1_1observer.html">observer&lt;observed_subject&gt;</a>&amp; o);</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"><a class="line" href="classmets_1_1subject.html#a604a3c6cb19a470779170e29528f3e83">  109</a></span>&#160;    <a class="code" href="classmets_1_1subject.html#a604a3c6cb19a470779170e29528f3e83">notify</a>();</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;    <a class="code" href="classmets_1_1subject.html">subject</a>();</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    std::set&lt;observer&lt;observed_subject&gt;*&gt; observers_m;</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;  };</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;  </div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> observed_subject&gt;</div>
<div class="line"><a name="l00126"></a><span class="lineno"><a class="line" href="classmets_1_1observer.html">  126</a></span>&#160;  <span class="keyword">class </span><a class="code" href="classmets_1_1observer.html">observer</a> </div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;  {</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    <span class="keyword">virtual</span></div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;    ~<a class="code" href="classmets_1_1observer.html">observer</a>() {};</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;    <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"><a class="line" href="classmets_1_1observer.html#a059bb913e90c74ccc4a18d92919bb331">  137</a></span>&#160;    <a class="code" href="classmets_1_1observer.html#a059bb913e90c74ccc4a18d92919bb331">update</a>(observed_subject*) = 0;</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;    <a class="code" href="classmets_1_1observer.html">observer</a>() {};</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;  };</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;  </div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160; </div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;  <span class="comment">// Implementation of the template methods in STL</span></div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;  </div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> observed_subject&gt;</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;  subject&lt;observed_subject&gt;::subject() </div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    : observers_m() { }</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;  </div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> observed_subject&gt;</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;  <span class="keywordtype">void</span> </div>
<div class="line"><a name="l00151"></a><span class="lineno"><a class="line" href="classmets_1_1subject.html#a580c481db07f883261c0a24f0f201067">  151</a></span>&#160;  <a class="code" href="classmets_1_1subject.html#a580c481db07f883261c0a24f0f201067">subject&lt;observed_subject&gt;::attach</a>(<a class="code" href="classmets_1_1observer.html">observer&lt;observed_subject&gt;</a>&amp; o)</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;  { observers_m.insert(&amp;o); }</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;  </div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> observed_subject&gt;</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;  <span class="keywordtype">void</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"><a class="line" href="classmets_1_1subject.html#af6b5055d74cb5671e46bb57a4109cf3a">  156</a></span>&#160;  <a class="code" href="classmets_1_1subject.html#af6b5055d74cb5671e46bb57a4109cf3a">subject&lt;observed_subject&gt;::detach</a>(<a class="code" href="classmets_1_1observer.html">observer&lt;observed_subject&gt;</a>&amp; o)</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;  { observers_m.erase(&amp;o); }</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;  </div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> observed_subject&gt;</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;  <span class="keywordtype">void</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"><a class="line" href="classmets_1_1subject.html#a604a3c6cb19a470779170e29528f3e83">  161</a></span>&#160;  <a class="code" href="classmets_1_1subject.html#a604a3c6cb19a470779170e29528f3e83">subject&lt;observed_subject&gt;::notify</a>() </div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;  {</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;    <span class="comment">// upcast the object to the real observer_subject type</span></div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;    observed_subject* real_subject = <span class="keyword">static_cast&lt;</span>observed_subject*<span class="keyword">&gt;</span>(<span class="keyword">this</span>);</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    std::for_each(observers_m.begin(), observers_m.end(), </div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;          <a class="code" href="classmets_1_1update__observer.html">update_observer&lt;observed_subject&gt;</a>(real_subject));</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;  }</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;  </div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;}</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160; </div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;<span class="preprocessor">#endif </span><span class="comment">// METS_OBSERVER_HH_</span></div>
<div class="ttc" id="aclassmets_1_1observer_html"><div class="ttname"><a href="classmets_1_1observer.html">mets::observer</a></div><div class="ttdoc">Template base class for the observers of some observed_subject</div><div class="ttdef"><b>Definition:</b> observer.hh:127</div></div>
<div class="ttc" id="aclassmets_1_1observer_html_a059bb913e90c74ccc4a18d92919bb331"><div class="ttname"><a href="classmets_1_1observer.html#a059bb913e90c74ccc4a18d92919bb331">mets::observer::update</a></div><div class="ttdeci">virtual void update(observed_subject *)=0</div><div class="ttdoc">This method is automatically called when this observer is attached to a &quot;notified&quot; subject.</div></div>
<div class="ttc" id="aclassmets_1_1subject_html"><div class="ttname"><a href="classmets_1_1subject.html">mets::subject</a></div><div class="ttdoc">template class for subjects (cfr. Observer Design Pattern).</div><div class="ttdef"><b>Definition:</b> observer.hh:84</div></div>
<div class="ttc" id="aclassmets_1_1subject_html_a580c481db07f883261c0a24f0f201067"><div class="ttname"><a href="classmets_1_1subject.html#a580c481db07f883261c0a24f0f201067">mets::subject::attach</a></div><div class="ttdeci">virtual void attach(observer&lt; observed_subject &gt; &amp;o)</div><div class="ttdoc">Attach a new observer to this subject.</div><div class="ttdef"><b>Definition:</b> observer.hh:151</div></div>
<div class="ttc" id="aclassmets_1_1subject_html_a604a3c6cb19a470779170e29528f3e83"><div class="ttname"><a href="classmets_1_1subject.html#a604a3c6cb19a470779170e29528f3e83">mets::subject::notify</a></div><div class="ttdeci">virtual void notify()</div><div class="ttdoc">Notify all attached observers.</div><div class="ttdef"><b>Definition:</b> observer.hh:161</div></div>
<div class="ttc" id="aclassmets_1_1subject_html_af6b5055d74cb5671e46bb57a4109cf3a"><div class="ttname"><a href="classmets_1_1subject.html#af6b5055d74cb5671e46bb57a4109cf3a">mets::subject::detach</a></div><div class="ttdeci">virtual void detach(observer&lt; observed_subject &gt; &amp;o)</div><div class="ttdoc">Detach a new observer to this subject.</div><div class="ttdef"><b>Definition:</b> observer.hh:156</div></div>
<div class="ttc" id="aclassmets_1_1update__observer_html"><div class="ttname"><a href="classmets_1_1update__observer.html">mets::update_observer</a></div><div class="ttdoc">Functor class to update observers with a for_each, only intended for internal use.</div><div class="ttdef"><b>Definition:</b> observer.hh:57</div></div>
<div class="ttc" id="aclassmets_1_1update__observer_html_a0f20603c0e9d109d2b8b26a4391ef588"><div class="ttname"><a href="classmets_1_1update__observer.html#a0f20603c0e9d109d2b8b26a4391ef588">mets::update_observer::update_observer</a></div><div class="ttdeci">update_observer(observed_subject *who)</div><div class="ttdoc">Ctor.</div><div class="ttdef"><b>Definition:</b> observer.hh:60</div></div>
<div class="ttc" id="aclassmets_1_1update__observer_html_ace0cfbc6604dbad39b7557bca3a2b9e1"><div class="ttname"><a href="classmets_1_1update__observer.html#ace0cfbc6604dbad39b7557bca3a2b9e1">mets::update_observer::operator()</a></div><div class="ttdeci">void operator()(observer&lt; observed_subject &gt; *o)</div><div class="ttdoc">Subscript operator to update an observer.</div><div class="ttdef"><b>Definition:</b> observer.hh:63</div></div>
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